RT9829 Datasheet, PDF (1/9 Pages) Richtek Technology Corporation – Dual Push-Button Reset

RT9829
Dual Push-Button Reset with Push-Button Controlled
Output Delay
General Description
The RT9829 has two combined delayed reset inputs (SR0,
SR1) with a user selectable delayed setup time (t_SRC)
option of either 7.5s or 12.5s (typ.), selectable via the
dual-state DSR input pin. When DSR is connected to
ground, t_SRC = 7.5s (typ.); when connected to V_CC, t_SRC
= 12.5s (typ.). There are two reset outputs which become
active simultaneously after both of the reset inputs are
held active for the selected t_SRC delay time. The outputs
remain asserted until either or both inputs go to inactive
logic level (for this device the output reset pulse duration
is fully push-button controlled, meaning neither fixed nor
minimum reset pulse width, nor power on reset pulse is
implemented). The first reset output, RST1, is active low,
open drain; the second reset output, RST2, is active high,
push-pull. The device fully operates over a broad V_CC range
from 1.65V to 5.5V. Below 1.575V (typ.), the inputs are
ignored and the outputs are de-asserted. The de-asserted
reset output levels are then valid down to 1V.
The RT9829 is available in a tiny WDFN-8L 2x2 (COL)
package.
Ordering Information
RT9829
Package Type
QW : WDFN-8L 2x2 (COL)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Features
z Dual Reset Push-Button Inputs
` User Selectable Delay Setup Time : 7.5s and 12.5s
(typ.)
z Push-Button Controlled Reset Pulse Duration
` No Fixed nor Minimum Pulse Width Guaranteed
z No Power On Reset
z Dual Reset Outputs
` RST1 : Active Low, Open-Drain
` RST2 : Active High, Push-Pull
z Fixed Reset Input Logic Voltage Levels
z Broad Operating Voltage Range : 1.65V to 5.5V
` Inactive Reset Output Levels Valid Down to 1V
z 2μA Low Supply Current
z Operating Temperature : −40°C to 85°C
z Small Thermally Enhanced 8-Lead WDFN Package
z RoHS Compliant and Halogen Free
Applications
z Mobile phones, Smartphones
z e-Books
z MP3 Players
z Games
z Portable Navigation Devices
Pin Configurations
(TOP VIEW)
RST2 1
VSS 2
SR1 3
RST1 4
8 VCC
7 SR0
6 NC
5 DSR
WDFN-8L 2x2 (COL)
Marking Information
56 : Product Code
56W
W : Date Code
DS9829-00 July 2011
www.richtek.com
1